Aqueous cross-linkable polymer dispersions

Abstract

An aqueous cross-linkable copolymer dispersion is formed by emulsion polymerization of a monomer mixture comprising at least one ethylenically unsaturated main monomer and at least one 1,3-dicarbonyl functionalized monomer and lysine or a salt thereof.

1 . An aqueous cross-linkable copolymer dispersion formed by emulsion polymerization of a monomer mixture comprising at least one ethylenically unsaturated main monomer and at least one 1,3-dicarbonyl functionalized monomer; and lysine or a salt thereof. 
     
     
         2 . The dispersion of  claim 1 , wherein the at least one ethylenically unsaturated main monomer is selected from the group consisting of esters of ethylenically unsaturated carboxylic acids, vinyl esters of C 1 -C 18  alkanoic acids, vinyl-aromatic compounds having up to 20 carbon atoms, vinyl esters of aromatic acids, C 2 -C 8  aliphatic hydrocarbons with 1 or 2 double bonds, ethylenically unsaturated nitriles, vinyl halides, vinyl ethers of C 1 -C 10  alcohols, and mixtures of these monomers. 
     
     
         3 . The dispersion of  claim 1 , wherein said at least one ethylenically unsaturated main monomer comprises at least one C 1 -C 12 -alkyl ester of acrylic or methacrylic acid. 
     
     
         4 . The dispersion of  claim 1 , wherein the monomer mixture comprises from 50 to 99 pphm of one or more C 1 -C 12  alkyl esters of acrylic and methacrylic acid. 
     
     
         5 . The dispersion of  claim 1 , wherein the monomer mixture comprises from 0.5 to 10 pphm of at least one 1,3-dicarbonyl functionalized monomer. 
     
     
         6 . The dispersion of  claim 1 , wherein the at least one 1,3-dicarbonyl functionalized monomer comprises an acetoacetyl group. 
     
     
         7 . The dispersion of  claim 1 , wherein the at least one 1,3-dicarbonyl functionalized monomer comprises an acetoacetoxyalkyl ester of acrylic or methacrylic acid. 
     
     
         8 . The dispersion of  claim 1 , wherein the at least one 1,3-dicarbonyl functionalized monomer comprises 2-acetoacetoxyethyl methacrylate. 
     
     
         9 . The dispersion of  claim 1 , wherein the copolymer dispersion is produced by emulsion polymerization in at least two stages, wherein the monomer mixture polymerized in at least one stage comprises at least one 1,3-dicarbonyl functionalized monomer. 
     
     
         10 . The dispersion of  claim 1 , wherein the lysine comprises a dl-racemic mixture. 
     
     
         11 . The dispersion of  claim 1 , wherein the weight average particle size of the polymer particles is below 200 nm. 
     
     
         12 . The dispersion of  claim 1 , wherein the weight average particle size of the polymer particles is below 150 nm. 
     
     
         13 . The dispersion of  claim 1 , wherein lysine or a salt thereof is present in an amount such that the molar ratio of amino groups to carbonyl groups in the dispersion is from about 0.1 to about 2.0. 
     
     
         14 . The dispersion of  claim 1 , wherein lysine or a salt thereof is present in an amount such that the molar ratio of amino groups to carbonyl groups in the dispersion is from about 0.5 to about 1.5. 
     
     
         15 . The dispersion of  claim 1 , wherein lysine or a salt thereof is present in an amount such that the molar ratio of amino groups to carbonyl groups in the dispersion is from about 0.75 to about 1.33. 
     
     
         16 . A water redispersible powder comprising a dried form of the dispersion of  claim 1 . 
     
     
         17 . A coating composition comprising the dispersion of  claim 1 . 
     
     
         18 . A paint or lacquer comprising the coating composition of  claim 17 . 
     
     
         19 . An adhesive comprising the coating composition of  claim 17 . 
     
     
         20 . A printing ink comprising the coating composition of  claim 17 .